Mark L Psiaki

7305021, Dec 4, 2007

Dec 22, 2005

11/316536

Brent M. Ledvina - Ithaca NY, US
Mark L. Psiaki - Brooktondale NY, US
Steven P. Powell - Ithaca NY, US

Cornell Research Foundation, Inc. - Ithaca NY

H04K 1/10

375137, 708250

A real-time software receiver that executes on a general purpose processor. The software receiver includes data acquisition and correlator modules that perform, in place of hardware correlation, baseband mixing and PRN code correlation using bit-wise parallelism.

7372400, May 13, 2008

Nov 7, 2005

11/268317

Clark E. Cohen - Washington DC, US
Robert W. Brumley - Narberth PA, US
Mark L. Psiaki - Brooktondale NY, US
Gregory M. Gutt - Brambleton VA, US
William J. Bencze - El Granada CA, US
Brent M. Ledvina - Austin TX, US
Barton G. Ferrell - Troy IL, US
David A. Whelan - Newport Coast CA, US

The Boeing Company - Chicago IL

G01S 1/00

34235701, 34235706, 34235716, 701213

A navigation system provides a significant level of protection against all forms of interference or jamming to GPS in a cost-effective way. The system employs a network of ground reference stations and Low Earth Orbiting (LEO) satellites in conjunction with GPS. A common-view ranging geometry to a GPS satellite is established that links a reference station and a user. A second common-view geometry to a LEO satellite between the same reference station and user pair is also established. The ground stations synthesize real-time aiding signals by making carrier phase measurements of GPS the LEO satellite signals. This aiding information is transmitted via the LEO satellites to the user receiver at high power to penetrate ambient jamming. The user receiver locks onto the carrier phase of the LEO satellite, demodulates the aiding information, then applies the carrier phase measurements and the aiding information to enable extended coherent measurements of the GPS signals. The system thereby recovers the GPS signals that would otherwise be lost to the jamming.

7978130, Jul 12, 2011

May 1, 2009

12/434026

Clark E. Cohen - Washington DC, US
Todd E. Humphreys - Half Moon Bay CA, US
Brent M. Ledvina - San Francisco CA, US
William J. Bencze - Half Moon Bay CA, US
Mark L. Psiaki - Brooktondale NY, US
Bryan T. Galusha - Oakland CA, US

Coherent Navigation, Inc. - San Mateo CA

G01S 19/18
G01S 19/25
G01S 19/33

34235756, 34235764, 34235769, 34235773, 34235775

A practical method for adding new high-performance, tightly integrated Nav-Com capability to any Global Navigation Satellite System (GNSS) user equipment requires no hardware modifications to the existing user equipment. In one example, the iGPS concept is applied to a Defense Advanced GPS Receiver (DAGR) and combines Low Earth Orbiting (LEO) satellites, such as Iridium, with GPS or other GNSS systems to significantly improve the accuracy, integrity, and availability of Position, Navigation, and Timing (PNT) and to enable new communication enhancements made available by the synthesis of precisely coupled navigation and communication modes. To achieve time synchronization stability between the existing DAGR and a plug-in iGPS enhancement module, a special-purpose wideband reference signal is generated by the iGPS module and coupled to the DAGR via the existing antenna port.

20040213334, Oct 28, 2004

Jan 8, 2004

10/753927

Brent Ledvina - Ithaca NY, US
Mark Psiaki - Brooktondale NY, US
Steven Powell - Ithaca NY, US
Paul Kintner - Ithaca NY, US

Cornell Research Foundation, Inc.

H04B001/707

375/150000

A real-time software receiver that executes on a general purpose processor. The software receiver includes data acquisition and correlator modules that perform, in place of hardware correlation, baseband mixing and PRN code correlation using bit-wise parallelism.

20110238307, Sep 29, 2011

Mar 28, 2011

13/072939

Mark Lockwood Psiaki - Brooktondale NY, US
Isaac Thomas Miller - San Mateo CA, US
Brent Michael Ledvina - San Francisco CA, US

G01C 21/00
G01S 19/00
G01S 19/45

701213, 3423572, 34235728, 701207

A navigation system includes a navigation radio and a sensor onboard a vehicle. The navigation radio receives and processes low earth orbit RF signals to derive range observables for a corresponding LEO satellite. A sensor is operable to generate at least one of vehicle speed data, acceleration data, angular rate data and rotational angle data under high vehicle dynamics. The navigation radio includes a navigation code operable to obtain a position, velocity and time solution (a “navigation solution”) based on the one or more range observables, ephemerides for the corresponding LEO satellite, a heading pseudomeasurement, a navigation radio altitude pseudomeasurement; one or more vehicle velocity pseudomeasurements orthogonal to the altitude pseudomeasurements; and the generated at least one of vehicle speed data, acceleration data, angular rate data and rotational angle data. The navigation radio uses the navigation solution to acquire a GPS signal during interference with a coarse acquisition GPS signal.

20120121087, May 17, 2012

Mar 12, 2010

13/255984

Mark L. Psiaki - Brooktondale NY, US

CORNELL UNIVERSITY - Ithaca NY

H04K 1/00

380255

A system and method for detecting spoofing of signals by processing intermittent bursts of encrypted Global Navigation Satellite System (GNSS) signals in order to determine whether unencrypted signals are being spoofed.

20160313449, Oct 27, 2016

Jun 6, 2016

15/174957

- Cupertino CA, US
Clark E. Cohen - Washington DC, US
Robert W. Brumley - San Mateo CA, US
William J. Bencze - Half Moon Bay CA, US
Brent M. Ledvina - San Francisco CA, US
Thomas J. Holmes - Palo Alto CA, US
Mark L. Psiaki - Brooktondale NY, US

Apple Inc. - Cupertino CA

G01S 19/25
G01S 19/26

Position, navigation and/or timing (PNT) solutions may be provided with levels of precision that have previously and conventionally been associated with carrier phase differential GPS (CDGPS) techniques that employ a fixed terrestrial reference station or with GPS PPP techniques that employ fixed terrestrial stations and corrections distribution networks of generally limited terrestrial coverage. Using techniques described herein, high-precision PNT solutions may be provided without resort to a generally proximate, terrestrial ground station having a fixed and precisely known position. Instead, techniques described herein utilize a carrier phase model and measurements from plural satellites (typically 4 or more) wherein at least one is a low earth orbiting (LEO) satellite. For an Iridium LEO solution, particular techniques are described that allow extraction of an Iridium carrier phase observables, notwithstanding TDMA gaps and random phase rotations and biases inherent in the transmitted signals.